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A mule is a sterile hybrid of a male donkey and a female horse.Mules are smaller than horses but stronger than donkeys, making them useful as pack animals.. In biology, a hybrid is the offspring resulting from combining the qualities of two organisms of different varieties, subspecies, species or genera through sexual reproduction.
Species of the fruit-fly Drosophila are one of the most commonly used organisms in evolutionary research, and have been used to test many theories related to the evolution of species. The genus Drosophila comprises numerous species that have varying degrees of premating and postmating isolation (including hybrid sterility) between them.
Such that, only a few fertile females have been found amongst the other species among the thousands that have been analyzed. However, when hybrids are produced between both species, the gene flow between the two will continue to be impeded as the hybrid males are sterile. Also, and in contrast with the great vigor shown by the sterile males ...
A hybrid animal is one with parentage of two separate species, differentiating it from crossbred animals, which have parentage of the same species. Hybrids are usually, but not always, sterile. [5] One of the most ancient types of hybrid animal is the mule, a cross between a female horse and a male donkey.
In humans, barring intersex conditions causing aneuploidy and other unusual states, it is the male that is heterogametic, with XY sex chromosomes.. Haldane's rule is an observation about the early stage of speciation, formulated in 1922 by the British evolutionary biologist J. B. S. Haldane, that states that if — in a species hybrid — only one sex is inviable or sterile, that sex is more ...
It’s a close cousin of Ebola that’s been dubbed the “bleeding eye” virus due to one of ... There are two kinds of ... Get this 'luxury hotel'-like queen set while it's at an all-time low ...
In a different game or situation, I would have made a bigger effort to avoid the sack," Favre continued. "But at no point was I thinking about hurting Gastineau. Maybe it crossed my mind to help ...
Echinometra viridis, one of several species in the genus that produce fertile hybrids Laboratory matings of closely related sea urchin species Echinometra oblonga and E. sp. C (the species is unnamed, dubbed C ) produce fertile and viable hybrids, but are unable to fertilize eggs of the parent species due to divergence of the alleles that code ...